package encrypter;

import android.annotation.SuppressLint;
import android.util.Base64;

import javax.crypto.Cipher;
import java.io.UnsupportedEncodingException;
import java.security.spec.AlgorithmParameterSpec;
import java.security.spec.KeySpec;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;

@SuppressLint("TrulyRandom")
public class Encrypter {
    static Cipher ecipher;
    static Cipher dcipher;

    // 8-byte Salt
    byte[] salt = {
        (byte)0xA9, (byte)0x9B, (byte)0xC8, (byte)0x32,
        (byte)0x56, (byte)0x35, (byte)0xE3, (byte)0x03
    };

    // Iteration count
    int iterationCount = 19;
    public static final Encrypter NAGASAKTI = new Encrypter("NagaSakti");
    
    @SuppressLint("TrulyRandom")
	private Encrypter(String passPhrase) {
        try {
            // Create the key
            KeySpec keySpec = new PBEKeySpec(passPhrase.toCharArray(), salt, iterationCount);
            SecretKey key = SecretKeyFactory.getInstance(
                "PBEWithMD5AndDES").generateSecret(keySpec);
            ecipher = Cipher.getInstance(key.getAlgorithm());
            dcipher = Cipher.getInstance(key.getAlgorithm());

            // Prepare the parameter to the ciphers
            AlgorithmParameterSpec paramSpec = new PBEParameterSpec(salt, iterationCount);

            // Create the ciphers
            ecipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);
            dcipher.init(Cipher.DECRYPT_MODE, key, paramSpec);
        } catch (java.security.InvalidAlgorithmParameterException e) {
        } catch (java.security.spec.InvalidKeySpecException e) {
        } catch (javax.crypto.NoSuchPaddingException e) {
        } catch (java.security.NoSuchAlgorithmException e) {
        } catch (java.security.InvalidKeyException e) {
        }
    }

    public static String encrypt(String str) {
        try {
            // Encode the string into bytes using utf-8
            byte[] utf8 = str.getBytes("UTF8");

            // Encrypt
            byte[] enc = ecipher.doFinal(utf8);
            byte[] base64enc = Base64.encode(enc, Base64.DEFAULT);
            
            final String encStr = new String(base64enc);
            return encStr;
            
            // Encode bytes to base64 to get a string
            //return enc.toString();
            
        } catch (javax.crypto.BadPaddingException e) {
        } catch (IllegalBlockSizeException e) {
        } catch (UnsupportedEncodingException e) {
        }
        return null;
    }

    public static String decrypt(String str) {
        try {
        	//new Base64();
			byte[] dec = Base64.decode(str, Base64.DEFAULT);
            // Decrypt
            byte[] utf8 = dcipher.doFinal(dec);
            // Decode using utf-8
            return new String(utf8, "UTF8");
        } catch (javax.crypto.BadPaddingException e) {
        } catch (IllegalBlockSizeException e) {
        } catch (UnsupportedEncodingException e) {
        }
        return null;
    }
    
    public static void main(String args[]){
      String encrypted = Encrypter.encrypt("bismillah");
      System.out.println(encrypted);
      String decrypted = Encrypter.decrypt("eYLD6UnwrQE=");
      System.out.println(decrypted);
    }
}
